package string;

public class StringBuilderDemo {
    public static void main(String[] args) {
        String str2 = "好好学习Java";
        StringBuilder builder = new StringBuilder(str2);//复制str的内容到builder中-----好好学习Java
        builder.append(",为了找个好工作");//append():追加内容----在末尾追加
        System.out.println(builder);

         //replace():替换部分内容(含头不含尾)
        builder.replace(9, 19, "就是为了改变世界");
        System.out.println(builder);


        //delete():删除部分内容(含头不含尾)
        builder.delete(0,8);
        System.out.println(builder);

        //insert():插入内容
        builder.insert(0,"活着");
        System.out.println(builder);








        //StringBuilder的创建方式
        StringBuilder builder1 = new StringBuilder();
        StringBuilder builder2 = new StringBuilder("abc");


//String和StringBuilder互传
        String str = "abc";
        StringBuilder builder3 = new StringBuilder(str);
        String str1 = builder3.toString();


    }
}